Air pressure type electronic parking braking system

Abstract

The invention discloses an air pressure type electronic parking braking system. The system comprises an electric control unit (1), an air storage tank (2), a relay valve (6) and a spring energy storage brake cylinder (7), wherein the air pressure input end of the relay valve (6) is connected with the output end of the air storage tank (2); the other end of the relay valve (6) is connected with theinput end of the spring energy storage brake cylinder (7); an air path between the output end of the air storage tank (2) and the control input end of the relay valve (6) is sequentially connected with a first electromagnetic valve (3) and a second electromagnetic valve (4) in series; an air path between the output end of the second electromagnetic valve (4) and the control input end of the relayvalve (6) is also provided with an air pressure sensor (5); the first electromagnetic valve (3), the second electromagnetic valve (4) and the air pressure sensor (5) are all electrically connected with the electric control unit (1). The air pressure type electronic parking braking system is high in inflation and deflation speed and rapid in brake response.

Description

technical field [0001] The invention belongs to the technical field of brake systems for medium and heavy vehicles, in particular to a pneumatic parking brake system with quick brake application and release response. Background technique [0002] The traditional handbrake is gradually eliminated due to the inability to meet the needs of special people and the phenomenon of slipping due to the lack of driver experience when starting on a slope. The pneumatic electronic parking brake system collects and processes various sensor information, and controls the solenoid valve to inflate and deflate the brake air chamber in a timely manner, so as to realize the parking release and parking brake of the car. At present, most medium and heavy vehicles use pneumatic electronic parking systems. [0003] Chinese invention patent application (patent number 201410026018.9, published on April 30, 2014) discloses an air pressure adjustable parking brake device, which includes an air storage...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the small diameter of the solenoid valve in the air circuit between the relay valve and the spring energy storage brake cylinder, it has a throttling effect, which will reduce the charging and discharging speed, resulting in slow charging and discharging, and the response time of applying and releasing the brake long;

[0005] 2. In order to increase the charging and deflation speed, the solenoid valve in the air path between the relay valve and the spring energy storage brake cylinder needs to use a large-aperture solenoid valve, which will lead to high production costs

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